Most traditional resources, like books, are starting to seem obsolete considering they seem to use a model of low house prices, low interest rates and being able to keep raising rental rates.

I buy REO's and obsolete municipal properties, so the assessed values vs my purchase prices have huge gaps... i.e.

What business is tried and true, is unlikely to become obsolete, is blessed by economies of scale, and above all has built-in cash flow ?

They are supposed to be more likely to have repair parts for in the future where the big-name units are obsoleted necessitating system replacement when a part could fix the problem if it was available.

General Public - I'm tired of you thinking we are obsolete, someone has to be accountable for showing property and responsible if something happens.

I can't say there's a book that gave me much insight on specifics, mostly because the structure of so many deals is based on the market that the property is in, and regulations change so often, a book of that nature would become obsolete fairly quickly.

You want to watch out for obsolete things or annoying things that people don't want.

For example I would consider anything with less than 20' clear height functionally obsolete as industrial buildings are growing in height every year to accommodate new high bay distribution strategies. 24'+ is ideal.

@Jacob Breazile - Make sure to account for the following expenses:1) Mortgage2) Mortgage insurance (PMI or MIP) or FHA Risk base3) Property Taxes4) City Taxes5) HOA (Home Owner’s Association) Dues and Fees and Assessments6) Insurance Property Hazard InsuranceFlood InsuranceEarthquake InsuranceUmbrella Insurance7) Vacancy Rate (usually 8% - the equivalent to one month a year, or 5-6% if multifamily and/or if experienced, if not use 8%)8) Utilities (you’ll have these if your tenant is not covering them and/or during vacancy) Water § Sewer § GarbageElectricityNatural GasPropane9) General Maintenance (usually 5%) Upkeep § LandscapingSnow removalRepairsNew Appliances10) Capital Expenditures (usually 5%, higher is the property is old and obsolete, less if fully rehabbed and all mechanicals and roof are new)11) Property Management (8%, even if you self manage, your time still has value and there might be a time when you'll want to be completely hands off or you'll not be able to do it, vacation, retirement, etc.)

That is an obsolete 18th century "Mercantilist" view of economics.